S.D. Codified Laws § 46A-18-8

Directors of the proposed district may be elected either at large or from director divisions, without regard to whether municipality areas are included within the district. If the petition states that the directors shall be elected from director divisions, the petition shall describe the boundaries of the divisions, which boundaries may be drawn either with or without regard to the corporate limits of any municipality included partly or wholly within the district boundaries. The director division boundaries shall be drawn so as to provide equitable representation for the qualified voters of the district.